Patents Reinstated Due to the Acceptance of a
                       Late Maintenance Fee From 3/28/97

Patent           Serial            Filing          Issue          Granted
Number           Number            Date            Date           Date

4,400,475        06/443,878        11/23/82        08/23/83       03/31/97
4,438,207        06/254,022        04/13/81        03/20/84       03/31/97
4,469,085        06/474,380        03/11/83        09/04/84       03/31/97
4,644,548        06/573,751        01/25/84        02/17/87       03/31/97
4,703,853        06/901,149        08/28/86        11/03/87       03/31/97
4,717,042        06/868,660        05/28/86        01/05/88       03/28/97
4,726,368        06/914,533        10/01/86        02/23/88       03/31/97
4,758,292        06/704,832        02/25/85        07/19/88       03/31/97
4,761,710        07/065,830        06/23/87        08/02/88       03/31/97
4,796,777        07/138,150        12/28/87        01/10/89       03/31/97
4,906,308        07/330,008        03/29/89        03/06/90       03/31/97
4,910,361        07/329,927        03/29/89        03/20/90       03/31/97
4,918,755        07/251,306        09/30/88        04/24/90       03/31/97
4,939,202        07/165,980        03/09/88        07/03/90       03/31/97
4,966,638        07/365,748        06/13/89        10/30/90       03/31/97
4,982,907        07/187,286        04/28/88        01/08/91       04/03/97
4,984,740        07/367,872        06/19/89        01/15/91       03/31/97
4,997,296        07/513,859        04/24/90        03/05/91       03/31/97
5,006,046        07/410,841        09/22/89        04/09/91       03/31/97
5,122,166        07/550,377        07/10/90        06/16/92       03/31/97
5,162,125        07/707,660        05/30/91        11/10/92       03/31/97

                 Patents Reinstated Due to the Acceptance of a
                       Late Maintenance Fee From 4/04/97

Patent           Serial            Filing          Issue          Granted
Number           Number            Date            Date           Date

Re. 34,248       07/552,800        07/13/90        05/11/93       04/04/97
4,815,415        07/147,311        03/28/88        03/28/89       04/07/97
4,950,664        07/245,031        09/16/88        08/21/90       04/08/97
4,980,572        07/124,172        01/25/88        12/25/90       04/09/97
5,045,575        07/451,693        12/18/89        09/03/91       04/07/97
5,045,575        07/451,693        12/18/89        09/03/91       04/07/97